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【单选题】
You perform a backup using the following BACKUP command: RMAN> BACKUP AS COMPRESSED BACKUPSET DATABASE,Which statement is true of this command?（）A.
A different procedure is required to restore a database from compressed backups
B.
The AS COMPRESSED clause of the BACKUP command provided by RMAN is used to create compressed backup sets and image copies.
C.
Using this command to create backups minimizes the bandwidth consumed.
D.
Using this command to create backups improves the performance of the backup process
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【单选题】沉浸式虚拟现实系统分为头盔式虚拟现实系统、洞穴式虚拟现实系统、座舱式虚拟现实系统、 ( ) 、远程存在系统。
A.
台式图形显示系统
B.
投影式虚拟现实系统
C.
分布式虚拟现实系统
D.
基于单眼显示系统